[Bug lto/58203] memset/memcpy are discarded with -flto

[kukyakya at gmail dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58203

--- Comment #1 from kukyakya at gmail dot com ---
Created attachment 30679
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30679&action=edit
Test case